div.showing {
    width: 80%;
    margin: 20px auto;
    border: 1px solid purple;
    padding: 30px;
}

div {
    font-style: italic;
    color: purple;
}

.even {
    background-color: red;
}

.odd {
    background-color: green;
}

p {
    color: green;
}

/* jquery使用到的css */
.pink {
    background-color: pink;
}

.green {
    background-color: green;
}

.border {
    border: 1px blue solid;
}